Trend Professional Replacement Tip Router Cutters RT/39X8MMTC - Rota-Tip Guided Rebater 38.1mm Diameter x 12mm Cut Key Features: Fitted with two blades that can be rotated four times Fitted with a double bearing Bearing ring accessories can be fitted to give different rebate sizes Rings are secured between the two bearings Specification: D: 1 1/2 inch (imperial diameter) D: 38.1 mm (metric diameter) C: 15/32 inch (imperial cut length) C: 12 mm (metric cut length) OL: 57.3 mm (overall length) Shank Diameter: 8 mm